HP21 scientific RPN calculator 2.4 Icon

HP21 scientific RPN calculator

Milan Cisár Tools
4.5
145 Ratings
10K+
Downloads
2.4
version
May 07, 2019
release date
2.2 MB
file size
Free
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What's New

Re-compiled to support Android 9

About HP21 scientific RPN calculator Android App

The HP-21 was a scientific calculator produced by Hewlett-Packard between 1975 and 1978. It was designed as a replacement for the HP-35, and was the first from so called Second Generation Handheld Calculators.

As with most HP calculators then and now, the HP-21 used RPN entry logic, with a four-level stack. It also had a single user-accessible memory register. A shift key provided access to functions whose legends were printed on the fronts of the tall trapezoidal keys.

To enhance practical usability, display was modified to show both X and Y register. Also I have eliminated mechanical DEG/RAD switch and moved the function under DSP button.
HP21 has few big enough buttons to be used comfortably on mobile devices.

Other Information:

Requires Android:
Android 1.6+
Other Sources:
Category:

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This version of HP21 scientific RPN calculator Android App comes with one universal variant which will work on all the Android devices.

Variant
10
(May 07, 2019)
Architecture
universal
Minimum OS
Android 1.6+
Screen DPI
nodpi (all screens)
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